Dental impression cup



J. K. NORTHWOOD. DENTAL IMPRESSION CUP.

APPLICATIQN FILED JAN. 24, 192!- 7 1,41 1,505. Patented Ap 4, 1922.

2 SHEETS-SHEET 1.

[NYE/ TOR J56, KJVOR 'rH WOOD,

,4 TTORNEYS J. K. NORTHWOOD. DENTAL IMPRESSION CUP. APPLlCATION men JAN.24. 1921.

Patented Apr. 4, 1922.

2 SHEETSSHEET 2- INVENTO/i J55. ff. A o/r' Tan 00o,

WITNESSES ATTORNEXS UNITED s r s PATENT OFFI'CE.

DENTAL IMPRESSION CUP.

Application filed January 24, 1921.

To all whom it may concern:

Be it known that I, Josnrn K. Non'rnwool), a subject of the King ofGreat Britain, and have declared my intentions of becoming a citizen ofthe United States, and am a resident of Washington, in the District ofColumbia, have invented certain new and useful Improvements in DentalImpression Cups, of which the following is a specification.

My invention relates to dental impression cups,and a purpose of myinvention'is the provision of a cup which can be contracted to cause theimpression material to be firmly compressed. against the sides of a jaw,thereby insuring a perfect impression of the jaw.

It is also a purpose of my invention to provide an impression cup inwhich the contracting feature is accomplished by jaws which aresupported for pivotal movement at such points as to eflect a uniformcontraction'thereof toward the front and medial portion of the cup so asto produce uniform compression of the impression material throughout thelength of a jaw. Furthermore, the companion jaws are capable of beinglocked in contracted position and are rcmovably associated with the bodyof the cup to permit of the substitution of jaws of any desired contourto suit human jaws of different contours.

I will describe three forms of impression cups embodying my inventionand will then point out the novel features thereof in claims.

In the accompanying drawings:

Figure 1 is a view showing in perspective and partly disassembled, oneform of impression cup embodying my invention.

Figure 2 is a perspective view showing in bottom plan. the body of thecup with the companion jaws removed.

Figure 3 is a top plan view, somewhat d iagrammatic, showing thecompanion jaws and locking means therefor.

Figure 4 is an enlarged detail perspective view of one of the companionjaws shown in Figures 1 and 2.

1 Figure 5 is a top plan view of'another form of impression cupembodying my invention.

Figure 6 is a bottom plan View of the cup shown in Figure 5.

Figure 7 is an enlarged detail perspective view of the body of the cupshown in Figures 5 and 6..

Specification of Letters Patent.

Patented Apr. 4, 1922.

Serial No. 439,599.

Figure 8 is a view similar to Figure 7 showing one of the jaws andbrackets comprised in the cup shown in Figures 5 and 6.

Figure 9 is a top plan View ofa third form of impression cup embodyingmy invention.

Figure 10 is a detail perspective view of one of the sections of the cupshown in Figure 9. I

Similar reference characters refer to similar parts in each of the seve'al views.

Referring specifically to the drawings and particularly to Figures 1 and2, B designates generally the body of the impressioh cup which is formedof any suitable metal and. which includes a convex central portion 15and a U-shaped lip portion 16 formed integral with and extending fromthe curved edge of the central portion 15. Secured to the lip 16 atpoints adjacent its opposite ends is a U-shaped supporting frame 17provided at its intermediate portion with a forwardly extending handle18 that is designed for the purpose of supporting the cup as a unit inproper position within the mouth. The frame 17 is secured to the lip 16by means of tubular rivets 19 and in such manner that the two lips aresupported in spaced parallel relation to each other as clearly shown inFigure 2. 0

F and F designate companion jaws, and each of these jaws comprises abase 20 of substantially the same general curvature as the lip 16 andthe frame 17. Upstanding from the outer edge of the baseQO is a flange21, such flange being co-extensive in length with the base and of aheight which may vary from one end of the fiange'to the other dependingupon the particular contour of the jaw to which the cup is to beapplied. The base 20 has a bayonet slot 20 at a point adjacent its rearend, such slot being adapted to receive the corresponding rivet 19 insuch manner as to pivot-ally support the jaw as a unit for inward andoutward swinging movement with relation to the cup body when effecting acontraction or expansion of the Soldered orotherwise secured to the jawsF and F adjacent their forward ends are substantially L-shaped brackets22,

i as

direction through the opening. The opposite end of the member is adaptedto receive a winged nut 24 which when rotated so as to feed inwardlyupon the member is adapted to move the brackets 22 together and tothereby effect a contraction of the jaws 'F" and F.

In the applied position of the jaws F and F to the body B of the cup,the base portions 20 are disposed between the lip 16 and the frame 17;the rivets 19 being (.lisposed at the rear ends of the bayonet slots20". In this. osition of the jaws, their forward ends over ap as clearlyshown in Figure 1, with the brackets 22 arranged substantially inparallel relation to each, other, so that by rotating the nuts 24, aninward movement of'the brackets 22 is effected to cause the inwardswingingof the jaws F andF about the rivets l9 asa center.

In. practice, the impression cup-1 having been supplied, with impressionmaterial, is inserted into the. mouth. of the patient and tossed intolace in theusual manner. The jitws F and?" which are in extendedposition are now contracted by rotation of the nut 24 so as to firmlycompress. the inipres Sion material against the sides of the jaw, Itisto be particularly noted that because of the pivotal mounting of thejaws F and F the contracting or drawing together thereof is toward thefrontor media-l, line of the cup, thereby exerting a uniform pressureupon the impression materialso as to obtain a perfect impression of thesides of the jaw. By virture of the fact that the fastening member 23and the nut 24, prevent expansion or outwardmovement of the brackets 22,it will be clear that the jaws F and F are locked in contracted positionso that the impression material is firmly held against the sides of thejawuntil it becomes set and the cup withdrawn.

As previous] described, the jaws F and F are remova ly associated with,the cup body, itbeing understood that the removal of the jaws can bereadily effected by so manipulating them as to remove the rivets 19 fromthe slots 20. This .removability permits of the substitution of otherjaws having flanges 21 of di'll'erent contoiu's, so as to render itpossible to accurately fit the con tour of any patients jaw andthus-secure a perfect impression.

eferrin now to Figures 5, 6 and T, I have here s own another form ofimpression cup embodying my invention which is used in the same manneras the first form ofmy invention, and is of substantially the sameconstruction. In the present embodiment, however, the lip, 16 ofthe bodyB- of the cup is fonned integral with the handle. 18, and the ends of"the lip 16 are formed with slots-25 adapted to receive securing members26 fixed to the jawsF and F for removably jaws pivotally supportedsustaining the jaws on the body. Brackets 27 and 27 are soldered orotherwlse secured to the aws F and F respectively, and each bracket isprovided with a flange 28 or 28 which is spaced from the base of the jawso" that in applied position of the jaw to the body, the flange servesto slidably retain the forward end of the jaw on the body. The bracket27 also includes an extension 29 which is associatedwith the'curved endof the jaw F so as to telescopically receive be tween the two theconfronting end of the jaw F ,it being'noted thatthe. upper edge of theflange is extended to span the space between the flange and the jaw.This arrangement of the flange obviously maintains the curved ends ofthe jaws F? and F in operative relation during thecontraction ofthe aws.

The brackets-27 and 2.7 aieiomned with openings which loosely receive athreaded fastening member, 30 that: eo-acts with a winged nut 31 to lockthejaws F and F in contracted positionin the same. manner as thBmBIHbBIS23 and. 24 of the first form of impression cup.

Referring now to Figures 9 and 10, I have here shown a third form ofimpression cup which consists of two sections S and S pivotallyconnected to each. other by means of a pin 32. Each section S or Sincludes a body portion 33, the confronting edge of which is arranged inoverlapped relation with respect to the adjacent edge of the othersection. The

pin 32 extends through the body portions adjacent the rear end of theconfrontin edges in the mannershown. Each section i or S also includes ajaw F or E formed integral with the body portion 33 or 33.

The curved end of the jaw F is. formed with a flange 34: which coactswith the jam to telescopically receive the confronting and of the jaw Fand-thusmaintain the ends of the jaws inoperative relation to each otherduring i expansion and contraction thereof.

he cup shown in Figures 9 and 10 is used substantially in the, samemanner as the other cups, it, however, being necessary in the presentinstance to grip the jaws themselves in eifecting a contraction of thesame when forcing the impression material around the sides of the jaws.

Although I have herein shown and. de

scribed only three forms of impression cup embodying my invention, it isto be understood that various changes and modifications may be madeherein without departing from the spirit of the invention and the spiritand scope of the appended claims.

What I claim is:

1. An'impression cup comprising, a. body, on thebody in a. manner topermit of their being contracted toward the front; and medial portion ofthe body, and means adapted to be arranged exteriorly of the mouth formoving and maintaining the jaws in contracted position.

2. An impression cup comprising, a body, jaws pivotally supported on thebody and removably associated therewith, said jaws being capable ofoccupying expanded and contracted positions, and means for moving thejaws to and maintaining the same in con tracted position, said meanscomprising brackets secured to the jaws, a member extending looselythrough the brackets, and a nut engageable with the member.

3. An impression cup comprising, a body including a U-shaped lip, aU-shaped frame secured and arranged in spaced relation to said lip,ahandle carried by the frame, a pair of jaws pivotally supported betweenthe frame and lip to occupy expanded and contracted positions, and meanscarried by the jaws for moving and maintaining the jaws in contractedposition.

l. An impression cup comprising, a body including a lip of U-form, aframe of U-form arranged in spaced parallel relation to the lip, rivetsextending through said lip and frame at points adjacent their oppositeends, jaws having bayonet slots formed therein to receive said rivets ina manner to cause the rivets to pivotally support the jaws between saidframe and lip, means carried by the jaws for drawing the same together,and a handle formed on said frame.

5. An impression cup comprising, a body including a U-shaped lip, aU-shapedframe arranged in spaced parallel relation to the lip, rivetsextending through the frame and lip at points adjacent their oppositeends, jaws pivotally supported by said rivets for inward and outwardswinging movement between said frame and lip, each of said jawscomprising a curved base portion having a bayonet slot formed therein,and a flange upstanding from the base portion and co extensive in lengththerewith, brackets carried by the forward ends of the flanges, andmeans engageable with the brackets for drawing the forward ends of thejaws together.

-6. An impression cup comprising, a body including a lip having slotsformed therein, a pair of jaws, pins carried by the jaws and insertablein said slots for pivotally supporting the jaws upon the body, means fortele scopioally associating the curved ends of the jaws, and means formoving and maintaining the jaws in contracted position.

7. An impression cup comprising, a body, j aws removably and pivotallysupported upon the body, brackets secured to the aws and includingretention flanges, slidably embracing the body, an extension formed onone of the brackets and spaced from the corresponding jaw to slidablyreceive between the two the confronting end of the other j aw, and meansextending through the brackets for moving and maintaining the jaws incontracted position.

JOSEPH K. NORTHVVOOD.

